The distance between the deep hole blasting of mediumsized bentonite mines and the village is safe Law

Theory and numerical simulation of deep hole cut blasting

2023年9月1日  The charge amount is kept the same as that of the first stage cut hole The distance between the center hole and the face ZY is 250 mm, the length of the charge is 121875 m, and the length of the plug is 128125 m A model for traditional wedgeshaped cut blasting By examining the blasting process, fragment size, damage distribution, and crater test results, the optimal blasting parameters were identified: a blasthole spacing of 18 m and a row spacing of Damage distribution characteristics and space optimizations 2023年9月7日  To ensure a good blasting effect, the empty hole should be in the range of the crack area of the charge hole, and the distance \({L}{2}\) between the center of the charge Optimization of Borehole Layout in Upwards MediumDeep Hole Cut BlastingIn response to the shortcomings of the original blasting design, a CSRC cut blasting rockbreaking technology has been proposed To enhance excavation efficiency, the depth of both cut holes Theory and field tests of innovative cut blasting method for

Optimization of the matching relationship between the

2023年10月16日  The test results showed that the best blasting scheme involves a burden of 5 cm and a stemming length of 5 cm, followed by that involving a burden of 4 cm and a 2023年3月27日  To solve the problem of the parameter design and optimization design of mediumdeep hole blasting in underground mines, a method of parameter design and the optimization of mediumdeep hole blasting based Refined Design and Optimization of 2022年12月25日  This paper proposes a blast stress wave attenuation equation and a peripheral hole distance calculation method under the combined action of in situ stress and joints First, Calculation of hole spacing and surrounding rock damage2024年5月18日  To increase the efficiency of deephole blasting driving in mine rock tunnels, an innovative pattern of wedge cutting blasting with holeinner delay was proposed First, the Research on the mechanism and application of wedge cutting blasting

Numerical Simulation on MediumDeep Hole Straight Cut Blasting

2024年11月16日  The results demonstrated that sectional charge blasting in the hole can expand the range of stress waves, and the segment interaction is also optimized by introducing a R is the distance—usually radial—from the measurement point to the blast face (m), W is the maximum charge per delay (kg), and the K and α are nondimensional coefficients related to the topographic and geological The Effect of Blast‐Hole Arrangement, Delay 2024年10月2日  In the openpit mining operations, the grouting curtain is widely used for the water blocking and the seepage prevention in mines, but it will lose its stability due to the influence of mining blasting In this paper, the reasonable safe distance between the deephole blasting position and the grouting curtain was studied the numerical model Safe Distance between the DeepHole Blasting and the 2022年9月14日  Rock burst is one of the challenging problems restricting the safe and highefficiency mining of deepburied coal seams, and roof deephole blasting (RDHB) is commonly practiced in highly burst Investigating the destressing mechanism of roof

(PDF) The Effect of BlastHole Arrangement,

2022年1月19日  The Effect of BlastHole Arrangement, Delay Time, and Decoupling Charge on Rock Damage and Vibration Attenuation in Multihole Blasting2024年9月7日  Through mediumdeep hole blasting’s simulation in the mine with sharply inclined thin veins, the blasting parameters of sectional blasting, Wtype hole layout and 09 m hole spacing were derived to save costs and reduce the rate of depletion loss under the premise of guaranteeing the effect of blasting, which can provide reference for other Simulating Blasting Parameters for Sharp Inclined Thin Vein Mines2024年1月10日  of gas extraction, the permeability enhancement technology of deep hole presplitting blasting is proposed, and the mechanism of blasting induced cracking of deep hole presplitting blasting is analyzed ANSYS/LSDYNA is used to simulate the propagation law of blasting stress wave and crack propagation under dierent process parametersStudy on the technology of permeability enhancement 2024年10月28日  The results of the field tests indicate that when the distance between the extraction hole and the blasting hole is less than 4 m, as the distance between the two holes increases, the extraction Study on antireflection of deep soft and high gas coal seam

Key Blasting Parameters for Deep‐Hole Excavation in an

2019年12月5日  The empty holes not only provide initial space for rock blasting but also convert the stress state around the rock as a free surface After the detonation of the charging hole, the shock wave generated by the explosion quickly attenuates into a stress wave []When the stress wave is transmitted to the empty hole, the reflection phenomenon will occur, leading to the 2023年8月31日  The grandscale suspended roofs overlying the goaf are commonly developed under thickhard rock strata (THRS) during the mining process of the deep coal seam As a result, strong mine seismicities triggered constantly by deep mining have impeded severely the safety and efficient operation of deep mines The workingface deephole blasting technology has Insight and Effectiveness of WorkingFace DeepHole Blasting 2021年3月23日  Gong et al studied the size of endmining coal pillar affected by the hard roofs and proposed a method combining presplitting and deep hole blasting to attenuate the abutment stress and reduce (PDF) Coupling Technology of DeepHole Presplitting Blasting 2024年9月11日  roof by deephole blasting, the blasting pressure relief technology was first used in the mining of metal mines in South Africa and achieved a good pressure relief effect ( Guest et al, 1995)Study on the Mechanism of Weakening Thick and Hard

Characteristics and Energy Distribution of Blast

2023年3月29日  Deephole blasting is generally a multihole blasting design with a large initial charge, a wide range of blasting energy , and a long duration of blastinduced ground vibration, which can cause 2022年7月22日  To address the problems with deephole presplit blasting intended to fracture and improve the permeability of deeply buried, soft, highgascontent coal seams, a method using a blasthole and a Blasting for Fracturing and Improving the 2023年2月16日  40 The entire operations of conduct of safe deephole drilling and blasting operations in the mine including transport of the explosive to the site of its use, shall be placed under the overall charge of a competent person holding First class manager’s certificate, hereinafter referred to as “Blasting Officer”, duly appointed in writing Conditions For DeepHole Blasting In Opencast Coal Mine2024年5月18日  To increase the efficiency of deephole blasting driving in mine rock tunnels, an innovative pattern of wedge cutting blasting with holeinner delay was proposed First, the blasting mechanisms of Research on the mechanism and application of wedge cutting blasting

Theoretical and numerical simulation investigation of deep hole

2023年3月11日  Drilling and blasting methods have been used as a common driving technique for shallowhole driving and blasting in rock roadways With the advent of digital electronic detonators and the need for increased production efficiency, the traditional blasting design is no longer suitable for deep hole blasting In this paper, a disperse charge cut blasting method 2024年7月10日  The principle of blasting hole arrangement in igneous rock intrusion area is determined by relevant numerical simulation analysis results: the optimal distance between blasting hole and igneous Damage evolution law of multihole blasting igneous rock 2024年11月16日  The efficiency of rock excavation depends on cut blasting However, mediumdeep hole cutting blasting faces the challenges of large clamping action and unsatisfactory blasting efficiency The study proposes sectional charge cutting blasting technology and analyzes the mechanism of cavity formation by establishing a numerical model The results Numerical Simulation on MediumDeep Hole Straight Cut Blasting 2021年10月13日  The positive effects of deep hole presplitting blasting permeability enhancement technology on the pressure relief and permeability enhancement of a low pressure and high gas coal seam were Study on the technology of enhancing permeability by deep hole

Refined Design and Optimization of Underground

mines, a method of parameter design and the optimization of mediumdeep hole blasting based on the blasting crater tests and numerical simulation analyses has been proposed in this study Based onAbstract: Taking the medium deep hole mining in steeply narrow vein of a gold mine in Inner Mongolia as the engineering background， through empirical analogies， numerical simulation and field tests methods， the evolution law of cracks in narrow veins of deep hole blasting under different blasting parameters was analyzed， and the relationship between the blasting Simulation and Parameters Optimization of Medium Deep Hole Blasting 2019年9月23日  The hanging of hard roof strata in the gobside retaining entry in deep mines could lead to dynamic disasters The pressure relief mechanism for the hard roof strata using shallowhole blasting was investigated by a Application of ShallowHole Blasting in 2021年4月6日  When a metro is constructed by the shield method in the strata containing boulder group, it is prone to some engineering problems such as serious cutter wear, deformation of the cutter holder head, damage of the cutter spindle, which seriously affects the construction efficiency and bring enormous problems to the shield construction This paper proposes the Assessing and controlling of boulder deephole blasting

A newly developed blasting cut in tunnels; application of

2023年12月1日  The distance between blast holes and uncharged holes (B 1) ranges from 1 to 2 times d (Langefors and Kilhstrom, 1963; Lopez and jemino,) In the present study the distance of 15d was found satisfactory with proper fragmentation and movement of the rock when blasted Burdens more than 2d result in a plastic deformation of the rock between blast 2021年12月9日  In order to alleviate stress concentration of roadsides and prevent rockbursts, the largediameter boreholes and deephole blasting are employed for partition pressure relief in the deep mining Optimization and Practice for Partition Pressure Relief of Deep 2023年10月12日  In upwards mediumdeep hole cut blasting, many connement eects exist due to the small number of free surfaces, which is mainly provided by an empty hole If the cut blasting effect cannot meet expectations, then subsequent blasting construc tion will be seriously aected, and large security risks to operators in the stope can be inducedOptimization of Borehole Layout in Upwards 2021年6月3日  Due to the high in situ stress of the deep rock mass and the restraining effect of the surrounding rock, the deep hole blasting of vertical shaft faces the problems of low borehole utilization rate and poor blasting effect In this regard, this paper proposes a deep hole multistage cut blasting technology of vertical shaft Preliminary engineering practice shows that such cut Numerical analysis of deep hole multistage cut blasting of

Study on the technology of permeability enhancement of deep hole

2023年12月29日  Different types of deephole blasting techniques are needed to solve gas drainage problems in complex and variable cases Blasting parameters suitable for mines are selected based on the 2022年6月1日  In the mining process of deep coal mines with a thick and hard roof, it is easy to form a large overhanging roof and accumulate a lot of strain energyStudy on the Mechanism of Weakening Thick and Hard Roof by DeepHole 2021年1月6日  A double wedge cut was used to improve the cut effects in the mediumdepth hole blasting of rock roadways First, the cavity formation mechanisms of single wedge cut and double wedge cut were analysed theoretically The results show that the cavity formation resistance of the secondorder wedge cut is reduced by the firstorder wedge cut Second, Study of the Double Wedge Cut Technique in MediumDepth Hole Blasting 2022年6月21日  For SanXin gold and copper mine, deep blasting large block rate is high resulting in difficulty in transporting the ore out; secondary blasting not only increases blasting costs but is more likely to cause the top and bottom plate of the underground to become loose causing safety hazards Based on the research background of Sanxin gold and copper mine, Parameter Optimization and Fragmentation Prediction of FanShaped Deep

Safe Distance between the DeepHole Blasting and the

2024年10月2日  In the openpit mining operations, the grouting curtain is widely used for the water blocking and the seepage prevention in mines, but it will lose its stability due to the influence of mining blasting In this paper, the reasonable safe distance between the deephole blasting position and the grouting curtain was studied the numerical model 2022年9月14日  Rock burst is one of the challenging problems restricting the safe and highefficiency mining of deepburied coal seams, and roof deephole blasting (RDHB) is commonly practiced in highly burst Investigating the destressing mechanism of roof 2022年1月19日  The Effect of BlastHole Arrangement, Delay Time, and Decoupling Charge on Rock Damage and Vibration Attenuation in Multihole Blasting(PDF) The Effect of BlastHole Arrangement, 2024年9月7日  Through mediumdeep hole blasting’s simulation in the mine with sharply inclined thin veins, the blasting parameters of sectional blasting, Wtype hole layout and 09 m hole spacing were derived to save costs and reduce the rate of depletion loss under the premise of guaranteeing the effect of blasting, which can provide reference for other Simulating Blasting Parameters for Sharp Inclined Thin Vein Mines

Study on the technology of permeability enhancement

2024年1月10日  of gas extraction, the permeability enhancement technology of deep hole presplitting blasting is proposed, and the mechanism of blasting induced cracking of deep hole presplitting blasting is analyzed ANSYS/LSDYNA is used to simulate the propagation law of blasting stress wave and crack propagation under dierent process parameters2024年10月28日  The results of the field tests indicate that when the distance between the extraction hole and the blasting hole is less than 4 m, as the distance between the two holes increases, the extraction Study on antireflection of deep soft and high gas coal seam 2019年12月5日  The empty holes not only provide initial space for rock blasting but also convert the stress state around the rock as a free surface After the detonation of the charging hole, the shock wave generated by the explosion quickly attenuates into a stress wave []When the stress wave is transmitted to the empty hole, the reflection phenomenon will occur, leading to the Key Blasting Parameters for Deep‐Hole Excavation in an 2023年8月31日  The grandscale suspended roofs overlying the goaf are commonly developed under thickhard rock strata (THRS) during the mining process of the deep coal seam As a result, strong mine seismicities triggered constantly by deep mining have impeded severely the safety and efficient operation of deep mines The workingface deephole blasting technology has Insight and Effectiveness of WorkingFace DeepHole Blasting

(PDF) Coupling Technology of DeepHole Presplitting Blasting

2021年3月23日  Gong et al studied the size of endmining coal pillar affected by the hard roofs and proposed a method combining presplitting and deep hole blasting to attenuate the abutment stress and reduce 2024年9月11日  roof by deephole blasting, the blasting pressure relief technology was first used in the mining of metal mines in South Africa and achieved a good pressure relief effect ( Guest et al, 1995)Study on the Mechanism of Weakening Thick and Hard

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